I have to add a handrail to the concrete steps that lead from the attached garage to the house. There are 2 steps. I would like to attach the posts to the side of the stairs. I would attach either a couple of notched 4 x 4s or a couple 2 x 4s. The 4 x 4 's notch would sit on the steps. The 2 x 4's would have 2 x 4s, which sit on the steps, lagged or bolted to them. I was going to use Tapcons to attach the wood to the side of the steps but just read that they are for light/medium duty use. I would think that a handrail would require more than a medium duty attachment. Also, is there a better way to make the attachment than to the side of the steps?